WO2022227443A1 - Display module and display device - Google Patents

Display module and display device Download PDF

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Publication number
WO2022227443A1
WO2022227443A1 PCT/CN2021/126052 CN2021126052W WO2022227443A1 WO 2022227443 A1 WO2022227443 A1 WO 2022227443A1 CN 2021126052 W CN2021126052 W CN 2021126052W WO 2022227443 A1 WO2022227443 A1 WO 2022227443A1
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WO
WIPO (PCT)
Prior art keywords
power supply
circuit board
line
power
connector
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PCT/CN2021/126052
Other languages
French (fr)
Chinese (zh)
Inventor
郭光冉
王中杰
Original Assignee
京东方科技集团股份有限公司
成都京东方光电科技有限公司
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Application filed by 京东方科技集团股份有限公司, 成都京东方光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Publication of WO2022227443A1 publication Critical patent/WO2022227443A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix

Definitions

  • the present application relates to the field of display technology, and in particular, to a display module and a display device.
  • foldable display products have also received extensive attention, and foldable display products have become a popular research direction due to their advantages of increasing the display area, and being more convenient for folding storage and transportation.
  • a display module including:
  • circuit board assembly comprising a first circuit board, a second circuit board, a third circuit board, a first connector, and a second connector;
  • a power module, a balance resistor and a plurality of first power supply lines are arranged on the first circuit board, the first end of the balance resistor is connected to the power module, and the second end of the balance resistor is connected to each The first ends of the first power supply lines are all connected, and the second ends of each of the first power supply lines are connected to the display panel;
  • the second circuit board is provided with a plurality of second power supply lines
  • the third circuit board is provided with a first power supply connection line
  • the first end of the first power supply connection line passes through the first connector connected to the power module
  • the second end of the first power connection line is connected to the first end of each of the second power supply lines through the second connector
  • each of the second power supply lines the second end of the line is connected to the display panel
  • the first power supply line and the second power supply line are configured to input power supply voltage signals to the display panel.
  • the ratio of the first resistance value to the second resistance value of the balance resistor is 0.9 to 1.1
  • the second resistance value is the contact resistance of the first connector and the contact resistance of the second connector.
  • the first circuit board is further provided with a second power supply connection line, and each of the first power supply supply lines is connected to the balance resistor through the second power supply connection line;
  • the second circuit board is further provided with a third power supply connection line, and each of the second power supply supply lines is connected to the second connector through the third power supply connection line.
  • the cross-sectional area of the second power supply connection line gradually increases from the direction close to the power supply module to the direction away from the power supply module, and/or each The cross-sectional area of the first power supply line increases sequentially;
  • the cross-sectional area of the third power supply connection line gradually increases from the direction close to the power supply module to the direction away from the power supply module, and/or, each of the second power supply connection lines increases gradually.
  • the cross-sectional area of the power supply lines increases sequentially.
  • the first power supply line and the second power supply connection line are arranged on the same layer, and the second power supply line and the third power supply connection line are arranged on the same layer.
  • a fourth power supply connection line is further provided on the first circuit board, the balancing resistor is connected to the power supply module through the fourth power supply connection line, and the first connector passes through the fourth power supply connection line.
  • the power connection line is connected with the power module.
  • the precision of the balance resistance is less than or equal to 1%.
  • the power module is located at an area of the first circuit board close to the second circuit board.
  • the display module further includes a first chip-on film and a second chip-on film, the first circuit board is bound to the display panel through the first chip-on film, and the second circuit board is bound to the display panel. The board is bound with the display panel through the second chip on film.
  • the first circuit board is a rigid printed circuit board or a flexible printed circuit board
  • the second circuit board is a rigid printed circuit board or a flexible printed circuit board
  • the third circuit board is a flexible printed circuit board.
  • the display panel is a foldable display panel
  • the extension direction of the folding axis of the foldable display panel is perpendicular to the direction in which the first circuit board points to the second circuit board
  • the folding axis is along the direction of the second circuit board.
  • the extension line extended in the extending direction is located in the area where the third circuit board is located.
  • a display device including the above-mentioned display module.
  • FIG. 1 shows a schematic structural diagram of a display module according to an embodiment of the present application
  • FIG. 2 shows a schematic diagram of a brightness test of a display panel according to an embodiment of the present application.
  • the circuit board to which the foldable display panel is connected includes a first circuit board and a second circuit board, a third circuit board is disposed between the first circuit board and the second circuit board, and the first circuit board is connected to the third circuit board.
  • the circuit board is connected through the first connector, and the second circuit board and the third circuit board are connected through the second connector; and a power supply module is arranged on the first circuit board, and the power supply module is directly connected with the first circuit board arranged on the first circuit board.
  • a power supply line is connected, and the power module is also connected to the second power supply line provided on the second circuit board through the first connector, the first power supply connection line and the second connector on the third circuit board.
  • the voltage value of the ELVDD signal provided by the power supply module to the second power supply line will decrease, and the power supply module directly provides
  • the decrease in the voltage value of the ELVDD signal of the first power supply line is very small, so that there is a voltage difference of several tens of millivolts between the ELVDD signal input from the first power supply line and the second power supply line to the display panel.
  • There is a difference in the display brightness in the display areas on both sides of the folding axis of the panel that is, the brightness in the display area corresponding to the display panel connected to the first circuit board is high, while the display area corresponding to the display panel connected to the second circuit board is high.
  • the brightness inside the foldable display panel is low, which in turn causes the display brightness of the foldable display panel to be uneven.
  • the voltage value of the power supply voltage signal of a fixed potential such as ELVDD provided by the power supply module to the first power supply line is also reduced, thereby reducing the first power supply line.
  • the voltage difference between the second power supply line and the ELVDD signal input to the display panel improves the uniformity of the display brightness of the display panel.
  • FIG. 1 a schematic structural diagram of a display module according to an embodiment of the present application is shown.
  • the embodiment of the present application discloses a display module, comprising: a display panel 10; a circuit board assembly, wherein the circuit board assembly includes a first circuit board 21, a second circuit board 22, a third circuit board 23, a first connector 24 and The second connector 25 .
  • the first circuit board 21 is provided with a power module 211, a balance resistor 212 and a plurality of first power supply lines 213.
  • the first end of the balance resistor 212 is connected to the power module 211, and the second end of the balance resistor 212 is connected to each The first ends of the first power supply lines 213 are all connected, and the second end of each first power supply line 213 is connected to the display panel 10 ;
  • the second circuit board 22 is provided with a plurality of second power supply lines 221 , the third
  • the circuit board 23 is provided with a first power connection wire 231 , the first end of the first power connection wire 231 is connected to the power module 211 through the first connector 24 , and the second end of the first power connection wire 231 is connected through the second connector 25 is connected to the first end of each second power supply line 221, and the second end of each second power supply line 221 is connected to the display panel 10;
  • the first power supply line 213 and the second power supply line 221 are connected by It is configured to input
  • the display panel 10 includes a plurality of light-emitting devices distributed in an array and a pixel driving circuit connected to each light-emitting device.
  • the circuit board assembly includes a first circuit board 21 , a second circuit board 22 , a third circuit board 23 , a first connector 24 and a second connector 25 .
  • the first connector 24 is located between the first circuit board 21 and the third circuit board 23 , the first connector 24 is soldered on the first circuit board 21 , and the first circuit board 21 communicates with the third circuit through the first connector 24
  • the board 23 is connected;
  • the second connector 25 is located between the third circuit board 23 and the second circuit board 22, the second connector 25 is soldered on the second circuit board 22, and the second circuit board 22 passes through the second connector 25 Connect with the third circuit board 23 ; and the first connector 24 and the second connector 25 are located at both ends of the third circuit board 23 .
  • the first circuit board 21 is provided with a power module 211, a balance resistor 212 and a plurality of first power supply lines 213.
  • the power module 211 and the balance resistor 212 are welded on the first circuit board 21, and the first power supply line 213 It is formed by directly etching the wiring film in the first circuit board 21 , and the material of the first power supply line 213 is a metal material, such as copper and other materials.
  • the power supply module 211 is actually a power supply chip, which includes a plurality of pins, such as power supply pins, ground pins, etc.
  • the first end of the balancing resistor 212 is connected to the power supply pin of the power supply module 211 that outputs the ELVDD signal.
  • the second end of the resistor 212 is connected to the first end of each of the first power supply lines 213 , and the second end of each of the first power supply lines 213 is connected to the display panel 10 . Therefore, the ELVDD signal output by the power module 211 is stepped down by the balancing resistor 212 , and then transmitted to each of the first power supply lines 213 , and then input to the display panel 10 through each of the first power supply lines 213 .
  • the third circuit board 23 is provided with a first power supply connection line 231, and the first connector 24 is connected to the power supply module 211 and the first power supply connection line 231 respectively, that is, the first end of the first power supply connection line 231 passes through the first connector. 24 is connected to the power supply module 211; the second circuit board 22 is provided with a plurality of second power supply lines 221, and the second connector 25 is respectively connected to the first power supply connection line 231 and the first power supply line 221 of each second power supply line 221. Both ends are connected, that is, the second end of the first power connection line 231 is connected to the first end of each second power supply line 221 through the second connector 25; and, the second end of each second power supply line 221 The terminal is connected to the display panel 10 .
  • the ELVDD signal output by the power module 211 is stepped down through the resistors corresponding to the first connector 24 , the first power connection line 231 and the second connector 25 , it is first transmitted to each of the second power supply lines 221 , and then passed through Each of the second power supply lines 221 is input into the display panel 10 .
  • the ELVDD signal provided by the power module 211 is provided to the first power supply line 213 on the first circuit board 21 after passing through the balancing resistor 212, and the ELVDD signal provided by the power module 211 also passes through the first connector 24, the first power supply line 213 A power connection line 231 and the second connector rear 25 are provided to the second power supply line 221 on the second circuit board 22. Due to the contact resistance of the first connector 24 and the second connector 25 and the first power connection line 231 In the presence of the trace resistance, the voltage value of the ELVDD signal provided by the power module 211 to the second power supply line 221 will decrease.
  • the power module 211 provides The voltage value of the ELVDD signal of the power supply line 213 is also reduced, thereby reducing the voltage difference of the ELVDD signal input by the first power supply line 213 and the second power supply line 221 to the display panel 10 , and improving the display brightness of the display panel 10 . uniformity.
  • the number of the first power supply lines 213 on the first circuit board 21 and the number of the second power supply lines 221 on the second circuit board 22 are both four as shown in FIG. 1 .
  • the first power supply lines 213 And the second power supply line 221 is used for inputting the ELVDD signal to the display panel 10, and the ELVDD signal is a high-level power supply signal.
  • the ratio of the first resistance value to the second resistance value of the balance resistor 212 is 0.9 to 1.1, and the second resistance value is the contact resistance of the first connector 24 , the contact resistance of the second connector 25 and the first power supply.
  • the first connector 24 and the second connector 25 are marked with their corresponding contact resistance resistance ranges, and the middle value of the resistance range of the first connector 24 is determined as the first connector 24
  • the resistance value of the contact resistance of the second connector 25 is determined as the middle value of the resistance value range of the second connector 25 as the resistance value of the contact resistance of the second connector 25 .
  • the resistance value of the contact resistance of the first connector 24 is in the range of 38m ⁇ to 42m ⁇ , then the resistance value of the contact resistance of the first connector 24 is determined to be 40m ⁇ , and the resistance value of the contact resistance of the second connector 25 is determined to be in the range of 38m ⁇ to 42m ⁇ . 42m ⁇ , the resistance value of the contact resistance of the second connector 25 is determined to be 40m ⁇ .
  • the resistance value R ⁇ L/S of the first power connection wire 231
  • ⁇ refers to the resistivity of the first power connection wire 231
  • the resistance of the first power connection wire 231 The resistivity can be determined
  • L refers to the length of the first power connection wire 231
  • S refers to the cross-sectional area of the first power connection wire 231, by measuring the length and cross-sectional area of the first power connection wire 231
  • the resistance value of the first power connection wire 231 can be estimated by dividing the product of the resistivity and the length of the first power connection wire 231 by the cross-sectional area of the first power connection wire 231 .
  • the sum of the resistance value of the contact resistance of the first connector 24 , the resistance value of the contact resistance of the second connector 25 and the resistance value of the wiring resistance of the first power connection line 231 is called the second resistance value.
  • the resistance value of the contact resistance of the first connector 24 is 40m ⁇
  • the resistance value of the contact resistance of the second connector 25 is 40m ⁇
  • the resistance value of the wiring resistance of the first power connection line 231 is 10m ⁇
  • the second resistance value is 40m ⁇ .
  • the value is 90m ⁇ .
  • an appropriate balance resistor 212 is selected according to the second resistance value, so that the ratio of the first resistance value to the second resistance value of the balance resistor 212 is 0.9 to 1.1.
  • the ratio of the first resistance value to the second resistance value of the balancing resistor 212 is 1, and at this time, the first resistance value of the balancing resistor 212 is equal to the second resistance value.
  • the second resistance value is 90m ⁇
  • the first resistance value of the selected balance resistor 212 is also 90m ⁇ .
  • the ratio of the first resistance value to the second resistance value of the balancing resistor 212 is closer to 1, the voltage difference of the ELVDD signal input by the first power supply line 213 and the second power supply line 221 to the display panel 10 is smaller, thereby further The uniformity of the display brightness of the display panel 10 is improved.
  • the accuracy of the balancing resistor 212 is less than or equal to 1%.
  • the precision of the balance resistance 212 is 1%, 0.5%, 0.1%, or the like.
  • the balancing resistor 212 When the value of the precision of the balancing resistor 212 is smaller, the corresponding accuracy is higher, so that the voltage difference of the ELVDD signal provided by the first power supply line 213 and the second power supply line 221 to the display panel 10 is smaller, thereby further The luminance uniformity of the display panel 10 is improved.
  • the embodiment of the present application The resistance value of the balance resistor 212 is also in the order of tens of milliohms.
  • the balancing resistor 212 with a resistance value of 55 m ⁇ is set without the balancing resistor 212 .
  • the brightness value of 13 test points was tested respectively by using a CA310 color analyzer under the W255 screen.
  • these 13 test points are A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12 and A13 in Fig. 2, with the upper left corner as the coordinate origin, then the test point A1
  • the coordinate value is (7.5mm, 7.5mm)
  • the coordinate value of the test point A2 is (7.5mm+L/2, 7.5mm)
  • the coordinate value of the test point A3 is (7.5mm+L, 7.5mm)
  • the coordinate value of the test point A5 is (7.5mm, 7.5mm+H/2)
  • the coordinate value of the test point A5 is (7.5mm+L/2, 7.5mm+H/2)
  • the coordinate value of the test point A6 is (7.5mm+ L, 7.5mm+H/2)
  • the coordinate value of test point A7 is (7.5mm, 7.5mm+H)
  • the coordinate value of test point A8 is (7.5mm+L/2, 7.5mm+H)
  • the coordinate value of A9 is
  • the uniformity value is 72.5%, and when the balancing resistor 212 of 55m ⁇ is set in the circuit board assembly, the uniformity value can be increased to 76.3%, When the balance resistance 212 of 93 m ⁇ is provided in the circuit board assembly, its uniformity value can be improved to 81.1%. Therefore, by adding a balancing resistor 212 between the power module 211 and the first power supply line 213 , the uniformity of the display brightness of the display panel 10 can be improved.
  • the first circuit board 21 is further provided with a second power supply connection line 214 , and each of the first power supply connection lines 213 is connected to the balancing resistor 212 through the second power supply connection line 214 ; on the second circuit board 22 A third power supply connection line 222 is also provided, and each second power supply line 221 is connected to the second connector 25 through the third power supply connection line 222 .
  • the first circuit board 21 is also provided with a fourth power supply connection line 215 , the balancing resistor 212 is connected to the power supply module 211 through the fourth power supply connection line 215 , and the first connector 24 is connected to the power supply module 211 through the fourth power supply connection line 215 connect.
  • the fourth power connection line 215 is in the shape of a "T" shape, which includes a first line segment, a second line segment and a third line segment, and the second line segment and the third line segment are respectively connected with the The first line segment is connected.
  • the extension direction of the first line segment is perpendicular to the direction in which the first circuit board 21 points to the second circuit board 22
  • the second line segment and the third line segment are parallel to the direction in which the first circuit board 21 points to the second circuit board 22
  • the second line segment faces the side of the first circuit board 21 away from the second circuit board 22
  • the third line segment faces the side of the first circuit board 21 close to the second circuit board 22 .
  • the extension direction of the second power supply connection line 214 is parallel to the direction in which the first circuit board 21 points to the second circuit board 22
  • the extension direction of the first power supply line 213 is perpendicular to the direction in which the first circuit board 21 points to the second circuit board 22
  • the extension direction of the third power supply line 222 is parallel to the direction of the first circuit board 21 pointing to the second circuit board 22
  • the extension direction of the second power supply line 221 is perpendicular to the direction of the first circuit board 21 pointing to the second circuit board 22
  • the extension direction of the first power connection line 231 is parallel to the direction of the first circuit board 21 pointing to the second circuit board 22 .
  • the power supply pin outputting the ELVDD signal in the power supply module 211 is connected to the first line segment of the fourth power supply connection line 215 , and the second line segment of the fourth power supply connection line 215 is connected to the first line segment of the balancing resistor 212 .
  • the second end of the balancing resistor 212 is connected to the second power connection line 214 , and the second power connection line 214 is also connected to the first end of each first power supply line 213 .
  • the third wire segment in the fourth power connection wire 215 is connected to the first connector 24, the first connector 24 is connected to the first end of the first power connection wire 231, and the second end of the first power connection wire 231 is connected to The second connector 25 is connected, and the second connector 25 is also connected with the third power connection line 222 , and the third power connection line 222 is also connected with the first end of each second power supply line 221 .
  • the cross-sectional area of the second power supply connection lines 214 gradually increases in the direction from the direction close to the power supply module 211 to the direction away from the power supply module 211, and/or each first power supply
  • the cross-sectional area of the line 213 increases sequentially; in the second circuit board 22, the cross-sectional area of the third power connection line 222 gradually increases from the direction close to the power module 211 to the direction away from the power module 211, and/or each The cross-sectional areas of the second power supply lines 221 are sequentially increased.
  • the part closer to the power module 211 has a smaller cross-sectional area, and the part farther away from the power module 211 has a larger cross-sectional area;
  • the part closer to the power supply module 211 has a smaller cross-sectional area, and the part farther away from the power supply module 211 has a larger cross-sectional area; and the second power supply line 221 that is closer to the power supply module 211
  • the smaller the cross-sectional area of the larger the cross-sectional area of the second power supply line 221 that is farther away from the power module 211 .
  • the cross-sectional area of the trace can be controlled by controlling the width and/or height of the trace.
  • the cross-sectional area of the second power supply connection line 214 can be increased by increasing the line width of the second power supply connection line 214
  • the third power supply connection line 222 can be increased by increasing the thickness of the third power supply connection line 222 cross-sectional area.
  • the cross-sectional area of the second power supply connection line 214 gradually increases, and/or each first power supply
  • the cross-sectional area of the supply line 213 increases sequentially, so that after the ELVDD signal provided by the power module 211 is stepped down through the balancing resistor 212, the voltage value of the ELVDD signal during transmission between the second power supply connection line 214 and the first power supply line 213 decreases.
  • the voltage difference of the ELVDD signal transmitted on each of the first power supply lines 213 in the first circuit board 21 is smaller, thereby further improving the brightness in the display area corresponding to the display panel 10 connected to the first circuit board 21 uniformity.
  • the cross-sectional area of the third power supply connection line 222 gradually increases, and/or each second power supply
  • the cross-sectional area of the supply line 221 increases sequentially, so that the reduction in the voltage value of the ELVDD signal when transmitted on the third power supply connection line 222 and the second power supply line 221 becomes smaller, then each of the first power supply lines on the second circuit board 22.
  • the voltage difference between the ELVDD signals transmitted on the two power supply lines 221 is smaller, thereby further improving the luminance uniformity in the display area corresponding to the display panel 10 connected to the second circuit board 22 .
  • the first power supply line 213 and the second power supply connection line 214 are provided on the same layer, and the second power supply line 221 and the third power supply connection line 222 are provided on the same layer.
  • the first power supply line 213 and the second power connection line 214 can be arranged on the same layer, so that the fabrication of the first power supply line 213 and the second power connection line 214 is simpler
  • the second power supply line 221 and the third power supply connection line 222 can also be arranged on the same layer, so that the production of the second power supply line 221 and the third power supply connection line 222 is easier. for simplicity.
  • first power supply line 213 and the second power connection line 214 may also be disposed in different layers.
  • first power supply line 213 is located on the first wiring layer
  • second power supply line 214 is located on the second wiring layer.
  • a first insulating layer is disposed between the first wiring layer and the second wiring layer, and the first power supply line 213 is connected to the second power supply connection line 214 through a first via hole passing through the first insulating layer;
  • the two power supply lines 221 and the third power connection line 222 can also be disposed in different layers.
  • the second power supply line 221 is located on the third wiring layer
  • the third power supply line 222 is located on the fourth wiring layer.
  • a second insulating layer is disposed between the wiring layer and the fourth wiring layer, and the second power supply line 221 is connected to the third power supply connection line 222 through a second via hole penetrating the second insulating layer.
  • the materials of the first power supply wire 213 and the second power connection wire 214 are the same, and the materials of the second power supply wire 221 and the third power connection wire 222 are also the same.
  • the materials of the first power supply line 213 , the second power supply line 214 , the second power supply line 221 and the third power supply line 222 are all copper.
  • the fourth power supply connection line 215 may be provided in the same layer as the first power supply connection line 213 and the second power supply connection line 214, or may be provided in a different layer with the first power supply connection line 213 and the second power supply connection line 214, which is implemented in this application. The example does not limit this.
  • the power module 211 is located at a region of the first circuit board 21 close to the second circuit board 22 .
  • the voltage drop is mainly caused by the first connector 24.
  • the first power supply connection line 231 and the second connector 25 influence the voltage of the ELVDD signal provided by the power supply module 211 to the first power supply line 213 via the balancing resistor 212, and the first power supply is connected to the first power supply via the first connector 24.
  • the difference in voltage between the line 231 and the voltage of the ELVDD signal supplied to the second power supply line 221 by the second connector 25 is small.
  • the display module further includes a first chip-on film 31 and a second chip-on film 32 , the first circuit board 21 is bound to the display panel 10 through the first chip-on film 31 , and the second circuit board 22 passes through The second chip on film 32 is bound to the display panel 10 .
  • the first chip-on-film 31 and the second chip-on-film 32 refer to COF (Chip On Film), which are provided with wirings, and the wirings on the first chip-on-film 31 connect the first chip on the first circuit board 21 .
  • the power supply line 213 is connected with the wiring in the display panel 10
  • the wiring on the second chip on film 32 connects the second power supply line 221 on the second circuit board 22 with the wiring in the display panel 10 .
  • first circuit board 21 and the display panel 10 are bound by two first chip on film 31 , and each first chip on film 31 is used to connect the two first power supply lines 213 to the display panel 10
  • the second circuit board 22 and the display panel 10 are also bound by two second chip on film 32, and each second chip on film 32 is used to connect the two second power supply lines 221 with the display Trace connections within panel 10 .
  • the first circuit board 21 is a rigid printed circuit board or a flexible printed circuit board
  • the second circuit board 22 is a rigid printed circuit board or a flexible printed circuit board
  • the third circuit board 23 is a flexible printed circuit board.
  • Rigid printed circuit board refers to PCBA (Printed Circuit Board Assembly), flexible printed circuit board refers to FPCA (Flexible Printed Circuit Assembly), and flexible printed circuit board refers to FPC (Flexible Printed Circuit).
  • the display panel 10 is a foldable display panel, the extension direction of the folding axis 11 of the foldable display panel is perpendicular to the direction in which the first circuit board 21 points to the second circuit board 22 , and the extension line after the folding axis 11 extends along the extension direction is located in the area where the third circuit board 23 is located.
  • the display panel 10 may be a foldable display panel, which has a folding axis 11, and the display panels 10 located on both sides of the folding axis 11 can be folded or unfolded along the folding axis 11.
  • the board 23 is a flexible circuit board, and the extension line of the folding shaft 11 extending along the extending direction is located in the area where the third circuit board 23 is located.
  • the display panel 10 may also be a non-folding display panel, which may also be connected to the first circuit board 11 and the second circuit board 12 respectively, and the first circuit board 11 and the second circuit board 12 are connected through the third circuit board 13 . .
  • the display panel 10 is actually an OLED (Organic Light Emitting Diode, organic light emitting diode) panel.
  • OLED Organic Light Emitting Diode, organic light emitting diode
  • the voltage value of the ELVDD signal provided by the power module to the second power supply line will decrease , therefore, by arranging a balance resistor on the first circuit board, the voltage value of the ELVDD signal provided by the power module to the first power supply line is also reduced, thereby reducing the input of the first power supply line and the second power supply line to the display
  • the voltage difference of the ELVDD signal of the panel improves the uniformity of the display brightness of the display panel.
  • the embodiment of the present application further discloses a display device including the above-mentioned display module.
  • the display device may be any product or component with display function, such as electronic paper, mobile phone, tablet computer, display, notebook computer, and navigator.
  • the display device when the display panel 10 in the display module is a foldable display panel, the display device also has a folding function.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the word “comprising” does not exclude the presence of elements or steps not listed in a claim.
  • the word “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • the present disclosure may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware.
  • the use of the words first, second, and third, etc. do not denote any order. These words can be interpreted as names.

Abstract

The present application provides a display module and a display device, and relates to the technical field of display. In the present application, a display panel and a circuit board assembly are provided, and the circuit board assembly comprises a first circuit board, a second circuit board, a third circuit board, a first connector and a second connector; the first circuit board is provided with a power module, a balance resistor and a plurality of first power supply lines, the balance resistor being separately connected to the power module and each first power supply line; the second circuit board is provided with a plurality of second power supply lines, and the third circuit board is provided with a first power connection line, the first power connection line being connected to the power module by means of the first connector, and the first power connection line being further connected to each second power supply line by means of the second connector. By providing a balance resistor on a first circuit board, the voltage difference of an ELVDD signal inputted to a display panel by first power supply lines and second power supply lines is reduced.

Description

显示模组及显示装置Display module and display device
相关申请的交叉引用CROSS-REFERENCE TO RELATED APPLICATIONS
本申请要求在2021年04月29日提交中国专利局、申请号为202120925489.9、名称为“显示模组及显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application with the application number 202120925489.9 and the title of "Display Module and Display Device" filed with the China Patent Office on April 29, 2021, the entire contents of which are incorporated into this application by reference.
技术领域technical field
本申请涉及显示技术领域，特别是涉及一种显示模组及显示装置。The present application relates to the field of display technology, and in particular, to a display module and a display device.
背景技术Background technique
随着柔性显示技术的不断发展，可折叠显示产品也得到了广泛的关注，可折叠显示产品由于其可以增大显示面积、折叠收纳和运输也较为方便等优势，成为当前热门的研究方向。With the continuous development of flexible display technology, foldable display products have also received extensive attention, and foldable display products have become a popular research direction due to their advantages of increasing the display area, and being more convenient for folding storage and transportation.
但是，在可折叠显示面板中，位于可折叠显示面板的折叠轴两侧的显示区域内的显示亮度存在差异，导致可折叠显示面板的显示亮度不均匀。However, in the foldable display panel, there is a difference in display brightness in the display areas located on both sides of the folding axis of the foldable display panel, resulting in uneven display brightness of the foldable display panel.
发明内容SUMMARY OF THE INVENTION
本申请一些实施例提供了如下技术方案：Some embodiments of the present application provide the following technical solutions:
第一方面，提供了一种显示模组，包括：In a first aspect, a display module is provided, including:
显示面板；display panel;
电路板组件，所述电路板组件包括第一电路板、第二电路板、第三电路板、第一连接器和第二连接器；a circuit board assembly comprising a first circuit board, a second circuit board, a third circuit board, a first connector, and a second connector;
其中，所述第一电路板上设置有电源模块、平衡电阻和多条第一电源供应线，所述平衡电阻的第一端与所述电源模块连接，所述平衡电阻的第二端与每条所述第一电源供应线的第一端均连接，每条所述第一电源供应线的第二端与所述显示面板连接；Wherein, a power module, a balance resistor and a plurality of first power supply lines are arranged on the first circuit board, the first end of the balance resistor is connected to the power module, and the second end of the balance resistor is connected to each The first ends of the first power supply lines are all connected, and the second ends of each of the first power supply lines are connected to the display panel;
所述第二电路板上设置有多条第二电源供应线，所述第三电路板上设置有第一电源连接线，所述第一电源连接线的第一端通过所述第一连接器与所述电源模块连接，所述第一电源连接线的第二端通过所述第二连接器与每条所述第二电源供应线的第一端均连接，每条所述第二电源供应线的第二端与所述显示面板连接；The second circuit board is provided with a plurality of second power supply lines, the third circuit board is provided with a first power supply connection line, and the first end of the first power supply connection line passes through the first connector connected to the power module, the second end of the first power connection line is connected to the first end of each of the second power supply lines through the second connector, and each of the second power supply lines the second end of the line is connected to the display panel;
所述第一电源供应线和所述第二电源供应线，被配置为向所述显示面板输入电源电压信号。The first power supply line and the second power supply line are configured to input power supply voltage signals to the display panel.
可选地，所述平衡电阻的第一阻值与第二阻值的比值为0.9至1.1，所 述第二阻值为所述第一连接器的接触电阻、所述第二连接器的接触电阻和所述第一电源连接线的走线电阻的阻值之和。Optionally, the ratio of the first resistance value to the second resistance value of the balance resistor is 0.9 to 1.1, and the second resistance value is the contact resistance of the first connector and the contact resistance of the second connector. The sum of the resistance value of the resistance and the wiring resistance of the first power supply connection line.
可选地，所述第一电路板上还设置有第二电源连接线，每条所述第一电源供应线均通过所述第二电源连接线与所述平衡电阻连接；Optionally, the first circuit board is further provided with a second power supply connection line, and each of the first power supply supply lines is connected to the balance resistor through the second power supply connection line;
所述第二电路板上还设置有第三电源连接线，每条所述第二电源供应线均通过所述第三电源连接线与所述第二连接器连接。The second circuit board is further provided with a third power supply connection line, and each of the second power supply supply lines is connected to the second connector through the third power supply connection line.
可选地，在所述第一电路板中，从靠近所述电源模块到远离所述电源模块的方向上，所述第二电源连接线的横截面积逐渐增大，和/或，各条所述第一电源供应线的横截面积依次递增；Optionally, in the first circuit board, the cross-sectional area of the second power supply connection line gradually increases from the direction close to the power supply module to the direction away from the power supply module, and/or each The cross-sectional area of the first power supply line increases sequentially;
在所述第二电路板中，从靠近所述电源模块到远离所述电源模块的方向上，所述第三电源连接线的横截面积逐渐增大，和/或，各条所述第二电源供应线的横截面积依次递增。In the second circuit board, the cross-sectional area of the third power supply connection line gradually increases from the direction close to the power supply module to the direction away from the power supply module, and/or, each of the second power supply connection lines increases gradually. The cross-sectional area of the power supply lines increases sequentially.
可选地，所述第一电源供应线和所述第二电源连接线同层设置，所述第二电源供应线和所述第三电源连接线同层设置。Optionally, the first power supply line and the second power supply connection line are arranged on the same layer, and the second power supply line and the third power supply connection line are arranged on the same layer.
可选地，所述第一电路板上还设置有第四电源连接线，所述平衡电阻通过所述第四电源连接线与所述电源模块连接，所述第一连接器通过所述第四电源连接线与所述电源模块连接。Optionally, a fourth power supply connection line is further provided on the first circuit board, the balancing resistor is connected to the power supply module through the fourth power supply connection line, and the first connector passes through the fourth power supply connection line. The power connection line is connected with the power module.
可选地，所述平衡电阻的精度小于或等于1％。Optionally, the precision of the balance resistance is less than or equal to 1%.
可选地，所述电源模块位于所述第一电路板靠近所述第二电路板的区域处。Optionally, the power module is located at an area of the first circuit board close to the second circuit board.
可选地，所述显示模组还包括第一覆晶薄膜和第二覆晶薄膜，所述第一电路板通过所述第一覆晶薄膜与所述显示面板绑定，所述第二电路板通过所述第二覆晶薄膜与所述显示面板绑定。Optionally, the display module further includes a first chip-on film and a second chip-on film, the first circuit board is bound to the display panel through the first chip-on film, and the second circuit board is bound to the display panel. The board is bound with the display panel through the second chip on film.
可选地，所述第一电路板为刚性印刷电路板或柔性印刷电路板，所述第二电路板为刚性印刷电路板或柔性印刷电路板，所述第三电路板为柔性电路板。Optionally, the first circuit board is a rigid printed circuit board or a flexible printed circuit board, the second circuit board is a rigid printed circuit board or a flexible printed circuit board, and the third circuit board is a flexible printed circuit board.
可选地，所述显示面板为可折叠显示面板，所述可折叠显示面板的折叠轴的延伸方向与所述第一电路板指向所述第二电路板的方向垂直，且所述折叠轴沿所述延伸方向延伸后的延长线位于所述第三电路板所在的区域内。Optionally, the display panel is a foldable display panel, the extension direction of the folding axis of the foldable display panel is perpendicular to the direction in which the first circuit board points to the second circuit board, and the folding axis is along the direction of the second circuit board. The extension line extended in the extending direction is located in the area where the third circuit board is located.
第二方面，提供了一种显示装置，包括上述的显示模组。In a second aspect, a display device is provided, including the above-mentioned display module.
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上 述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description, and in order to make the above-mentioned and other purposes, features and advantages of the present application more obvious and easy to understand , and the specific embodiments of the present application are listed below.
附图说明Description of drawings
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.
图1示出了本申请实施例的一种显示模组的结构示意图；1 shows a schematic structural diagram of a display module according to an embodiment of the present application;
图2示出了本申请实施例的显示面板的亮度测试示意图。FIG. 2 shows a schematic diagram of a brightness test of a display panel according to an embodiment of the present application.
具体实施例specific embodiment
为使本申请的上述目的、特征和优点能够更加明显易懂，下面结合附图和具体实施方式对本申请作进一步详细的说明。In order to make the above objects, features and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and specific embodiments.
在相关技术中，可折叠显示面板所连接的电路板包括第一电路板和第二电路板，第一电路板和第二电路板之间设置有第三电路板，第一电路板与第三电路板通过第一连接器连接，第二电路板与第三电路板通过第二连接器连接；并且，在第一电路板上设置有电源模块，电源模块直接与第一电路板上设置的第一电源供应线连接，而电源模块还通过第一连接器、第三电路板上的第一电源连接线和第二连接器，与第二电路板上设置的第二电源供应线连接。In the related art, the circuit board to which the foldable display panel is connected includes a first circuit board and a second circuit board, a third circuit board is disposed between the first circuit board and the second circuit board, and the first circuit board is connected to the third circuit board. The circuit board is connected through the first connector, and the second circuit board and the third circuit board are connected through the second connector; and a power supply module is arranged on the first circuit board, and the power supply module is directly connected with the first circuit board arranged on the first circuit board. A power supply line is connected, and the power module is also connected to the second power supply line provided on the second circuit board through the first connector, the first power supply connection line and the second connector on the third circuit board.
由于第一连接器和第二连接器的接触电阻以及第一电源连接线的走线电阻的存在，电源模块提供给第二电源供应线的ELVDD信号的电压值会降低，而电源模块直接提供给第一电源供应线的ELVDD信号的电压值的降低幅度很小，使得第一电源供应线和第二电源供应线输入至显示面板的ELVDD信号存在几十毫伏的压差，则位于可折叠显示面板的折叠轴两侧的显示区域内的显示亮度存在差异，即与第一电路板连接的显示面板对应的显示区域内的亮度高，而与第二电路板所连接的显示面板对应的显示区域内的亮度低，进而导致可折叠显示面板的显示亮度不均匀。Due to the contact resistance of the first connector and the second connector and the trace resistance of the first power supply connection line, the voltage value of the ELVDD signal provided by the power supply module to the second power supply line will decrease, and the power supply module directly provides The decrease in the voltage value of the ELVDD signal of the first power supply line is very small, so that there is a voltage difference of several tens of millivolts between the ELVDD signal input from the first power supply line and the second power supply line to the display panel. There is a difference in the display brightness in the display areas on both sides of the folding axis of the panel, that is, the brightness in the display area corresponding to the display panel connected to the first circuit board is high, while the display area corresponding to the display panel connected to the second circuit board is high. The brightness inside the foldable display panel is low, which in turn causes the display brightness of the foldable display panel to be uneven.
因此，本申请实施例通过在第一电路板上设置平衡电阻，使得电源模块提供给第一电源供应线的ELVDD等固定电位的电源电压信号的电压值也降低，从而减小第一电源供应线和第二电源供应线输入至显示面板的ELVDD信号的压差，提高了显示面板的显示亮度的均匀性。Therefore, in the embodiment of the present application, by arranging a balancing resistor on the first circuit board, the voltage value of the power supply voltage signal of a fixed potential such as ELVDD provided by the power supply module to the first power supply line is also reduced, thereby reducing the first power supply line. The voltage difference between the second power supply line and the ELVDD signal input to the display panel improves the uniformity of the display brightness of the display panel.
参照图1，示出了本申请实施例的一种显示模组的结构示意图。Referring to FIG. 1 , a schematic structural diagram of a display module according to an embodiment of the present application is shown.
本申请实施例公开了一种显示模组，包括：显示面板10；电路板组件，电路板组件包括第一电路板21、第二电路板22、第三电路板23、第一连接器24和第二连接器25。The embodiment of the present application discloses a display module, comprising: a display panel 10; a circuit board assembly, wherein the circuit board assembly includes a first circuit board 21, a second circuit board 22, a third circuit board 23, a first connector 24 and The second connector 25 .
其中，第一电路板21上设置有电源模块211、平衡电阻212和多条第一电源供应线213，平衡电阻212的第一端与电源模块211连接，平衡电阻212的第二端与每条第一电源供应线213的第一端均连接，每条第一电源供应线213的第二端与显示面板10连接；第二电路板22上设置有多条第二电源供应线221，第三电路板23上设置有第一电源连接线231，第一电源连接线231的第一端通过第一连接器24与电源模块211连接，第一电源连接线231的第二端通过第二连接器25与每条第二电源供应线221的第一端均连接，每条第二电源供应线221的第二端与显示面板10连接；第一电源供应线213和第二电源供应线221，被配置为向显示面板10输入电源电压信号，比如为像素驱动电路提供正向电压的ELVDD信号。The first circuit board 21 is provided with a power module 211, a balance resistor 212 and a plurality of first power supply lines 213. The first end of the balance resistor 212 is connected to the power module 211, and the second end of the balance resistor 212 is connected to each The first ends of the first power supply lines 213 are all connected, and the second end of each first power supply line 213 is connected to the display panel 10 ; the second circuit board 22 is provided with a plurality of second power supply lines 221 , the third The circuit board 23 is provided with a first power connection wire 231 , the first end of the first power connection wire 231 is connected to the power module 211 through the first connector 24 , and the second end of the first power connection wire 231 is connected through the second connector 25 is connected to the first end of each second power supply line 221, and the second end of each second power supply line 221 is connected to the display panel 10; the first power supply line 213 and the second power supply line 221 are connected by It is configured to input a power supply voltage signal to the display panel 10 , such as an ELVDD signal that provides a forward voltage for the pixel driving circuit.
在实际产品中，显示面板10包括多个阵列分布的发光器件以及与每个发光器件连接的像素驱动电路。In an actual product, the display panel 10 includes a plurality of light-emitting devices distributed in an array and a pixel driving circuit connected to each light-emitting device.
而电路板组件包括第一电路板21、第二电路板22、第三电路板23、第一连接器24和第二连接器25。第一连接器24位于第一电路板21与第三电路板23之间，第一连接器24焊接在第一电路板21上，且第一电路板21通过第一连接器24与第三电路板23连接；第二连接器25位于第三电路板23与第二电路板22之间，第二连接器25焊接在第二电路板22上，且第二电路板22通过第二连接器25与第三电路板23连接；而第一连接器24和第二连接器25位于第三电路板23的两端。The circuit board assembly includes a first circuit board 21 , a second circuit board 22 , a third circuit board 23 , a first connector 24 and a second connector 25 . The first connector 24 is located between the first circuit board 21 and the third circuit board 23 , the first connector 24 is soldered on the first circuit board 21 , and the first circuit board 21 communicates with the third circuit through the first connector 24 The board 23 is connected; the second connector 25 is located between the third circuit board 23 and the second circuit board 22, the second connector 25 is soldered on the second circuit board 22, and the second circuit board 22 passes through the second connector 25 Connect with the third circuit board 23 ; and the first connector 24 and the second connector 25 are located at both ends of the third circuit board 23 .
第一电路板21上设置有电源模块211、平衡电阻212和多条第一电源供应线213，电源模块211和平衡电阻212是焊接在第一电路板21上的，而第一电源供应线213是直接对第一电路板21中的走线薄膜刻蚀后形成的，该第一电源供应线213的材料为金属材料，如铜等材料。The first circuit board 21 is provided with a power module 211, a balance resistor 212 and a plurality of first power supply lines 213. The power module 211 and the balance resistor 212 are welded on the first circuit board 21, and the first power supply line 213 It is formed by directly etching the wiring film in the first circuit board 21 , and the material of the first power supply line 213 is a metal material, such as copper and other materials.
电源模块211实际上为电源芯片，其包括多个引脚，如电源引脚、接地引脚等，平衡电阻212的第一端是与电源模块211中输出ELVDD信号的电源引脚连接的，平衡电阻212的第二端与每条第一电源供应 线213的第一端均连接，且每条第一电源供应线213的第二端与显示面板10连接。因此，电源模块211输出的ELVDD信号经过平衡电阻212降压后，先传输至每条第一电源供应线213，再通过每条第一电源供应线213输入至显示面板10内。The power supply module 211 is actually a power supply chip, which includes a plurality of pins, such as power supply pins, ground pins, etc. The first end of the balancing resistor 212 is connected to the power supply pin of the power supply module 211 that outputs the ELVDD signal. The second end of the resistor 212 is connected to the first end of each of the first power supply lines 213 , and the second end of each of the first power supply lines 213 is connected to the display panel 10 . Therefore, the ELVDD signal output by the power module 211 is stepped down by the balancing resistor 212 , and then transmitted to each of the first power supply lines 213 , and then input to the display panel 10 through each of the first power supply lines 213 .
第三电路板23上设置有第一电源连接线231，第一连接器24分别与电源模块211和第一电源连接线231连接，即第一电源连接线231的第一端通过第一连接器24与电源模块211连接；第二电路板22上设置有多条第二电源供应线221，而第二连接器25分别与第一电源连接线231和每条第二电源供应线221的第一端均连接，即第一电源连接线231的第二端通过第二连接器25与每条第二电源供应线221的第一端均连接；并且，每条第二电源供应线221的第二端与显示面板10连接。因此，电源模块211输出的ELVDD信号经过第一连接器24、第一电源连接线231和第二连接器25所对应的电阻降压后，先传输至每条第二电源供应线221，再通过每条第二电源供应线221输入至显示面板10内。The third circuit board 23 is provided with a first power supply connection line 231, and the first connector 24 is connected to the power supply module 211 and the first power supply connection line 231 respectively, that is, the first end of the first power supply connection line 231 passes through the first connector. 24 is connected to the power supply module 211; the second circuit board 22 is provided with a plurality of second power supply lines 221, and the second connector 25 is respectively connected to the first power supply connection line 231 and the first power supply line 221 of each second power supply line 221. Both ends are connected, that is, the second end of the first power connection line 231 is connected to the first end of each second power supply line 221 through the second connector 25; and, the second end of each second power supply line 221 The terminal is connected to the display panel 10 . Therefore, after the ELVDD signal output by the power module 211 is stepped down through the resistors corresponding to the first connector 24 , the first power connection line 231 and the second connector 25 , it is first transmitted to each of the second power supply lines 221 , and then passed through Each of the second power supply lines 221 is input into the display panel 10 .
综上所述，电源模块211提供的ELVDD信号经过平衡电阻212后提供给第一电路板21上的第一电源供应线213，且电源模块211提供的ELVDD信号还经过第一连接器24、第一电源连接线231和第二连接器后25提供给第二电路板22上的第二电源供应线221，由于第一连接器24和第二连接器25的接触电阻以及第一电源连接线231的走线电阻的存在，电源模块211提供给第二电源供应线221的ELVDD信号的电压值会降低，因此，通过在第一电路板21上设置平衡电阻212，使得电源模块211提供给第一电源供应线213的ELVDD信号的电压值也降低，从而减小第一电源供应线213和第二电源供应线221输入至显示面板10的ELVDD信号的压差，提高了显示面板10的显示亮度的均匀性。To sum up, the ELVDD signal provided by the power module 211 is provided to the first power supply line 213 on the first circuit board 21 after passing through the balancing resistor 212, and the ELVDD signal provided by the power module 211 also passes through the first connector 24, the first power supply line 213 A power connection line 231 and the second connector rear 25 are provided to the second power supply line 221 on the second circuit board 22. Due to the contact resistance of the first connector 24 and the second connector 25 and the first power connection line 231 In the presence of the trace resistance, the voltage value of the ELVDD signal provided by the power module 211 to the second power supply line 221 will decrease. Therefore, by setting the balancing resistor 212 on the first circuit board 21, the power module 211 provides The voltage value of the ELVDD signal of the power supply line 213 is also reduced, thereby reducing the voltage difference of the ELVDD signal input by the first power supply line 213 and the second power supply line 221 to the display panel 10 , and improving the display brightness of the display panel 10 . uniformity.
此外，通过在电源模块211与第一电源供应线213之间增加平衡电阻212，基于平衡电阻212的限流作用，还可以防止电源模块211提供的大电流对第一电源供应线213连接的显示面板10造成影响。In addition, by adding a balancing resistor 212 between the power module 211 and the first power supply line 213, based on the current limiting effect of the balancing resistor 212, the display of the connection of the first power supply line 213 by the large current provided by the power module 211 can be prevented. Panel 10 makes an impact.
在实际产品中，第一电路板21上的第一电源供应线213和第二电路板22上的第二电源供应线221的数量均为图1所示的4条，第一电源供应线213和第二电源供应线221用于向显示面板10输入ELVDD 信号，该ELVDD信号为高电平电源信号。In an actual product, the number of the first power supply lines 213 on the first circuit board 21 and the number of the second power supply lines 221 on the second circuit board 22 are both four as shown in FIG. 1 . The first power supply lines 213 And the second power supply line 221 is used for inputting the ELVDD signal to the display panel 10, and the ELVDD signal is a high-level power supply signal.
可选地，平衡电阻212的第一阻值与第二阻值的比值为0.9至1.1，第二阻值为第一连接器24的接触电阻、第二连接器25的接触电阻和第一电源连接线231的走线电阻的阻值之和。Optionally, the ratio of the first resistance value to the second resistance value of the balance resistor 212 is 0.9 to 1.1, and the second resistance value is the contact resistance of the first connector 24 , the contact resistance of the second connector 25 and the first power supply. The sum of the resistance values of the trace resistances of the connection lines 231 .
在实际产品中，第一连接器24和第二连接器25上都标有其对应的接触电阻的阻值范围，将第一连接器24的阻值范围的中间值确定为第一连接器24的接触电阻的阻值，将第二连接器25的阻值范围的中间值确定为第二连接器25的接触电阻的阻值。In an actual product, the first connector 24 and the second connector 25 are marked with their corresponding contact resistance resistance ranges, and the middle value of the resistance range of the first connector 24 is determined as the first connector 24 The resistance value of the contact resistance of the second connector 25 is determined as the middle value of the resistance value range of the second connector 25 as the resistance value of the contact resistance of the second connector 25 .
例如，第一连接器24的接触电阻的阻值范围为38mΩ至42mΩ，则确定第一连接器24的接触电阻的阻值为40mΩ，第二连接器25的接触电阻的阻值范围为38mΩ至42mΩ，则确定第二连接器25的接触电阻的阻值为40mΩ。For example, the resistance value of the contact resistance of the first connector 24 is in the range of 38mΩ to 42mΩ, then the resistance value of the contact resistance of the first connector 24 is determined to be 40mΩ, and the resistance value of the contact resistance of the second connector 25 is determined to be in the range of 38mΩ to 42mΩ. 42mΩ, the resistance value of the contact resistance of the second connector 25 is determined to be 40mΩ.
而第一电源连接线231的阻值R＝ρL/S，ρ指的是第一电源连接线231的电阻率，当第一电源连接线231的材料选定后，第一电源连接线231的电阻率即可确定，L指的是第一电源连接线231的长度，S指的是第一电源连接线231的横截面积，通过测量第一电源连接线231的长度和横截面积，将第一电源连接线231的电阻率与长度的乘积，再除以第一电源连接线231的横截面积，可估算得到第一电源连接线231的阻值。The resistance value R=ρL/S of the first power connection wire 231, ρ refers to the resistivity of the first power connection wire 231, after the material of the first power connection wire 231 is selected, the resistance of the first power connection wire 231 The resistivity can be determined, L refers to the length of the first power connection wire 231, S refers to the cross-sectional area of the first power connection wire 231, by measuring the length and cross-sectional area of the first power connection wire 231, the The resistance value of the first power connection wire 231 can be estimated by dividing the product of the resistivity and the length of the first power connection wire 231 by the cross-sectional area of the first power connection wire 231 .
将第一连接器24的接触电阻的阻值、第二连接器25的接触电阻的阻值和第一电源连接线231的走线电阻的阻值之和称为第二阻值。例如，第一连接器24的接触电阻的阻值为40mΩ，第二连接器25的接触电阻的阻值为40mΩ，第一电源连接线231的走线电阻的阻值为10mΩ，则第二阻值为90mΩ。The sum of the resistance value of the contact resistance of the first connector 24 , the resistance value of the contact resistance of the second connector 25 and the resistance value of the wiring resistance of the first power connection line 231 is called the second resistance value. For example, the resistance value of the contact resistance of the first connector 24 is 40mΩ, the resistance value of the contact resistance of the second connector 25 is 40mΩ, and the resistance value of the wiring resistance of the first power connection line 231 is 10mΩ, then the second resistance value is 40mΩ. The value is 90mΩ.
因此，根据第二阻值选取合适的平衡电阻212，使得平衡电阻212的第一阻值与第二阻值的比值为0.9至1.1。Therefore, an appropriate balance resistor 212 is selected according to the second resistance value, so that the ratio of the first resistance value to the second resistance value of the balance resistor 212 is 0.9 to 1.1.
可选地，平衡电阻212的第一阻值与第二阻值的比值为1，此时，平衡电阻212的第一阻值等于第二阻值。例如，第二阻值为90mΩ，则选取的平衡电阻212的第一阻值也为90mΩ。Optionally, the ratio of the first resistance value to the second resistance value of the balancing resistor 212 is 1, and at this time, the first resistance value of the balancing resistor 212 is equal to the second resistance value. For example, if the second resistance value is 90mΩ, the first resistance value of the selected balance resistor 212 is also 90mΩ.
当平衡电阻212的第一阻值与第二阻值的比值越接近1时，第一电源供应线213和第二电源供应线221输入至显示面板10的ELVDD信号的压差越小，从而进一步提高显示面板10的显示亮度的均匀性。When the ratio of the first resistance value to the second resistance value of the balancing resistor 212 is closer to 1, the voltage difference of the ELVDD signal input by the first power supply line 213 and the second power supply line 221 to the display panel 10 is smaller, thereby further The uniformity of the display brightness of the display panel 10 is improved.
在实际产品中，平衡电阻212的精度小于或等于1％。例如，平衡电阻212的精度为1％、0.5％或0.1％等。In an actual product, the accuracy of the balancing resistor 212 is less than or equal to 1%. For example, the precision of the balance resistance 212 is 1%, 0.5%, 0.1%, or the like.
当平衡电阻212的精度的数值越小时，其对应的准确度越高，则使得第一电源供应线213和第二电源供应线221提供给显示面板10的ELVDD信号的压差越小，从而进一步提高显示面板10的亮度均匀性。When the value of the precision of the balancing resistor 212 is smaller, the corresponding accuracy is higher, so that the voltage difference of the ELVDD signal provided by the first power supply line 213 and the second power supply line 221 to the display panel 10 is smaller, thereby further The luminance uniformity of the display panel 10 is improved.
由于第一连接器24的接触电阻、第二连接器25的接触电阻和第一电源连接线231的走线电阻的阻值之和，基本上在几十毫欧级别，因此，本申请实施例中的平衡电阻212的阻值也在几十毫欧级别。Since the sum of the resistance values of the contact resistance of the first connector 24 , the contact resistance of the second connector 25 and the wiring resistance of the first power supply connection line 231 is basically at the level of several tens of milliohms, the embodiment of the present application The resistance value of the balance resistor 212 is also in the order of tens of milliohms.
如图2所示，为了验证增加平衡电阻212对显示面板10的亮度均匀性的提升效果，针对某一种类型的显示面板10，在不设置平衡电阻212、设置阻值为55mΩ的平衡电阻212以及设置阻值为93mΩ的平衡电阻212的情况下，采用CA310色彩分析仪在W255画面下分别测试13个测试点的亮度值。As shown in FIG. 2 , in order to verify the effect of increasing the balancing resistor 212 on the brightness uniformity of the display panel 10 , for a certain type of display panel 10 , the balancing resistor 212 with a resistance value of 55 mΩ is set without the balancing resistor 212 . And in the case of setting the balance resistor 212 with a resistance value of 93mΩ, the brightness value of 13 test points was tested respectively by using a CA310 color analyzer under the W255 screen.
其中，这13个测试点为图2中的A1、A2、A3、A4、A5、A6、A7、A8、A9、A10、A11、A12和A13，以左上角为坐标原点，则测试点A1的坐标值为(7.5mm，7.5mm)，测试点A2的坐标值为(7.5mm+L/2，7.5mm)，测试点A3的坐标值为(7.5mm+L，7.5mm)，测试点A4的坐标值为(7.5mm，7.5mm+H/2)，测试点A5的坐标值为(7.5mm+L/2，7.5mm+H/2)，测试点A6的坐标值为(7.5mm+L，7.5mm+H/2)，测试点A7的坐标值为(7.5mm，7.5mm+H)，测试点A8的坐标值为(7.5mm+L/2，7.5mm+H)，测试点A9的坐标值为(7.5mm+L，7.5mm+H)，测试点A10的坐标值为(7.5mm+L/4，7.5mm+H/4)，测试点A11的坐标值为(7.5mm+3L/4，7.5mm+H/4)，测试点A12的坐标值为(7.5mm+L/4，7.5mm+3H/4)，测试点A13的坐标值为(7.5mm+3L/4，7.5mm+3H/4)。Among them, these 13 test points are A1, A2, A3, A4, A5, A6, A7, A8, A9, A10, A11, A12 and A13 in Fig. 2, with the upper left corner as the coordinate origin, then the test point A1 The coordinate value is (7.5mm, 7.5mm), the coordinate value of the test point A2 is (7.5mm+L/2, 7.5mm), the coordinate value of the test point A3 is (7.5mm+L, 7.5mm), the test point A4 The coordinate value of the test point A5 is (7.5mm, 7.5mm+H/2), the coordinate value of the test point A5 is (7.5mm+L/2, 7.5mm+H/2), and the coordinate value of the test point A6 is (7.5mm+ L, 7.5mm+H/2), the coordinate value of test point A7 is (7.5mm, 7.5mm+H), the coordinate value of test point A8 is (7.5mm+L/2, 7.5mm+H), the test point The coordinate value of A9 is (7.5mm+L, 7.5mm+H), the coordinate value of test point A10 is (7.5mm+L/4, 7.5mm+H/4), and the coordinate value of test point A11 is (7.5mm +3L/4, 7.5mm+H/4), the coordinate value of test point A12 is (7.5mm+L/4, 7.5mm+3H/4), the coordinate value of test point A13 is (7.5mm+3L/4 , 7.5mm+3H/4).
经测试，可得到这13个测试点的亮度值如下表一所示：After testing, the brightness values of these 13 test points can be obtained as shown in Table 1 below:
Figure PCTCN2021126052-appb-000001
Figure PCTCN2021126052-appb-000001
表一Table I
可以看出，当在电路板组件中未设置平衡电阻212时，其均一性数值为72.5％，而当在电路板组件中设置55mΩ的平衡电阻212时，其均一性数值可提升至76.3％，当在电路板组件中设置93mΩ的平衡电阻212时，其均一性数值可提升至81.1％。因此，通过在电源模块211与第一电源供应线213之间增设平衡电阻212，可提升显示面板10的显示亮度的均匀性。It can be seen that when the balancing resistor 212 is not set in the circuit board assembly, the uniformity value is 72.5%, and when the balancing resistor 212 of 55mΩ is set in the circuit board assembly, the uniformity value can be increased to 76.3%, When the balance resistance 212 of 93 mΩ is provided in the circuit board assembly, its uniformity value can be improved to 81.1%. Therefore, by adding a balancing resistor 212 between the power module 211 and the first power supply line 213 , the uniformity of the display brightness of the display panel 10 can be improved.
在一些实施例中，第一电路板21上还设置有第二电源连接线214，每条第一电源供应线213均通过第二电源连接线214与平衡电阻212连接；第二电路板22上还设置有第三电源连接线222，每条第二电源供应线221均通过第三电源连接线222与第二连接器25连接。In some embodiments, the first circuit board 21 is further provided with a second power supply connection line 214 , and each of the first power supply connection lines 213 is connected to the balancing resistor 212 through the second power supply connection line 214 ; on the second circuit board 22 A third power supply connection line 222 is also provided, and each second power supply line 221 is connected to the second connector 25 through the third power supply connection line 222 .
此外，第一电路板21上还设置有第四电源连接线215，平衡电阻212通过第四电源连接线215与电源模块211连接，第一连接器24通过第四电源连接线215与电源模块211连接。In addition, the first circuit board 21 is also provided with a fourth power supply connection line 215 , the balancing resistor 212 is connected to the power supply module 211 through the fourth power supply connection line 215 , and the first connector 24 is connected to the power supply module 211 through the fourth power supply connection line 215 connect.
其中，如图1所示，第四电源连接线215的形状为“T”型，其包括第一走线段、第二走线段和第三走线段，第二走线段和第三走线段分别与第一走线段连接。第一走线段的延伸方向垂直于第一电路板21指向第二电路板22的方向，第二走线段和第三走线段均平行于第一电路板21指向第二电路板22的方向，且第二走线段朝向第一电路板21远离第二电路板22的一侧，第三走线段朝向第一电路板21靠近第二电路板22的一侧。Wherein, as shown in FIG. 1 , the fourth power connection line 215 is in the shape of a "T" shape, which includes a first line segment, a second line segment and a third line segment, and the second line segment and the third line segment are respectively connected with the The first line segment is connected. The extension direction of the first line segment is perpendicular to the direction in which the first circuit board 21 points to the second circuit board 22 , the second line segment and the third line segment are parallel to the direction in which the first circuit board 21 points to the second circuit board 22 , and The second line segment faces the side of the first circuit board 21 away from the second circuit board 22 , and the third line segment faces the side of the first circuit board 21 close to the second circuit board 22 .
而第二电源连接线214的延伸方向平行于第一电路板21指向第二电路板22的方向，第一电源供应线213的延伸方向垂直于第一电路板21指向第二电路板22的方向；第三电源连接线222的延伸方向平行于第一电路板21指向第二电路板22的方向，第二电源供应线221的延伸方向垂直于第一电路板21指向第二电路板22的方向；第一电源连接线231的延伸方向平行于第一电路板21指向第二电路板22的方向。The extension direction of the second power supply connection line 214 is parallel to the direction in which the first circuit board 21 points to the second circuit board 22 , and the extension direction of the first power supply line 213 is perpendicular to the direction in which the first circuit board 21 points to the second circuit board 22 . The extension direction of the third power supply line 222 is parallel to the direction of the first circuit board 21 pointing to the second circuit board 22, and the extension direction of the second power supply line 221 is perpendicular to the direction of the first circuit board 21 pointing to the second circuit board 22 ; The extension direction of the first power connection line 231 is parallel to the direction of the first circuit board 21 pointing to the second circuit board 22 .
在实际产品中，电源模块211中输出ELVDD信号的电源引脚与第四电源连接线215中的第一走线段连接，第四电源连接线215中的第二走线段与平衡电阻212的第一端连接，平衡电阻212的第二端与第二电源连接线214连接，第二电源连接线214还与每条第一电源供应线213的第一端均连接。In an actual product, the power supply pin outputting the ELVDD signal in the power supply module 211 is connected to the first line segment of the fourth power supply connection line 215 , and the second line segment of the fourth power supply connection line 215 is connected to the first line segment of the balancing resistor 212 . The second end of the balancing resistor 212 is connected to the second power connection line 214 , and the second power connection line 214 is also connected to the first end of each first power supply line 213 .
而第四电源连接线215中的第三走线段与第一连接器24连接，第一连接器24与第一电源连接线231的第一端连接，第一电源连接线231的第二端与第二连接器25连接，第二连接器25还与第三电源连接线222连接，第三电源连接线222还与每条第二电源供应线221的第一端均连接。The third wire segment in the fourth power connection wire 215 is connected to the first connector 24, the first connector 24 is connected to the first end of the first power connection wire 231, and the second end of the first power connection wire 231 is connected to The second connector 25 is connected, and the second connector 25 is also connected with the third power connection line 222 , and the third power connection line 222 is also connected with the first end of each second power supply line 221 .
可选地，在第一电路板21中，从靠近电源模块211到远离电源模块211的方向上，第二电源连接线214的横截面积逐渐增大，和/或，各条第一电源供应线213的横截面积依次递增；在第二电路板22中，从靠近电源模块211到远离电源模块211的方向上，第三电源连接线222的横截面积逐渐增大，和/或，各条第二电源供应线221的横截面积依次递增。Optionally, in the first circuit board 21, the cross-sectional area of the second power supply connection lines 214 gradually increases in the direction from the direction close to the power supply module 211 to the direction away from the power supply module 211, and/or each first power supply The cross-sectional area of the line 213 increases sequentially; in the second circuit board 22, the cross-sectional area of the third power connection line 222 gradually increases from the direction close to the power module 211 to the direction away from the power module 211, and/or each The cross-sectional areas of the second power supply lines 221 are sequentially increased.
也就是说，在第二电源连接线214中，越靠近电源模块211的部位其横截面积越小，越远离电源模块211的部位其横截面积越大；而越靠近电源模块211的第一电源供应线213的横截面积越小，越远离 电源模块211的第一电源供应线213的横截面积越大。That is to say, in the second power supply connection line 214 , the part closer to the power module 211 has a smaller cross-sectional area, and the part farther away from the power module 211 has a larger cross-sectional area; The smaller the cross-sectional area of the power supply line 213 is, the larger the cross-sectional area of the first power supply line 213 that is farther from the power module 211 is.
在第三电源连接线222中，越靠近电源模块211的部位其横截面积越小，越远离电源模块211的部位其横截面积越大；而越靠近电源模块211的第二电源供应线221的横截面积越小，越远离电源模块211的第二电源供应线221的横截面积越大。In the third power supply connection line 222 , the part closer to the power supply module 211 has a smaller cross-sectional area, and the part farther away from the power supply module 211 has a larger cross-sectional area; and the second power supply line 221 that is closer to the power supply module 211 The smaller the cross-sectional area of , the larger the cross-sectional area of the second power supply line 221 that is farther away from the power module 211 .
需要说明的是，可通过控制走线的线宽和/或高度，来控制走线的横截面积。例如，通过将第二电源连接线214的线宽增大来提高第二电源连接线214的横截面积，或者，通过将第三电源连接线222的厚度增大来提高第三电源连接线222的横截面积。It should be noted that the cross-sectional area of the trace can be controlled by controlling the width and/or height of the trace. For example, the cross-sectional area of the second power supply connection line 214 can be increased by increasing the line width of the second power supply connection line 214 , or the third power supply connection line 222 can be increased by increasing the thickness of the third power supply connection line 222 cross-sectional area.
当第二电源连接线214的各个部位的横截面积相等，且各条第一电源供应线213的横截面积都相等时，由于第二电源连接线214和第一电源供应线213的走线电阻的存在，电源模块211提供的ELVDD信号经过平衡电阻212降压后，ELVDD信号在第二电源连接线214和第一电源供应线213上传输时的电压值也逐渐减小。因此，本申请实施例将第一电路板21中，从靠近电源模块211到远离电源模块211的方向上，第二电源连接线214的横截面积逐渐增大，和/或各条第一电源供应线213的横截面积依次递增，使得电源模块211提供的ELVDD信号经过平衡电阻212降压后，ELVDD信号在第二电源连接线214和第一电源供应线213传输时的电压值的减小幅度变小，则第一电路板21内的各个第一电源供应线213上传输的ELVDD信号的压差更小，从而进一步提高第一电路板21连接的显示面板10对应的显示区域内的亮度均匀性。When the cross-sectional area of each part of the second power connection line 214 is equal, and the cross-sectional area of each of the first power supply lines 213 is the same, due to the routing between the second power connection line 214 and the first power supply line 213 With the existence of the resistor, after the ELVDD signal provided by the power module 211 is stepped down by the balancing resistor 212 , the voltage value of the ELVDD signal transmitted on the second power connection line 214 and the first power supply line 213 also gradually decreases. Therefore, in the embodiment of the present application, in the first circuit board 21, from the direction close to the power supply module 211 to the direction away from the power supply module 211, the cross-sectional area of the second power supply connection line 214 gradually increases, and/or each first power supply The cross-sectional area of the supply line 213 increases sequentially, so that after the ELVDD signal provided by the power module 211 is stepped down through the balancing resistor 212, the voltage value of the ELVDD signal during transmission between the second power supply connection line 214 and the first power supply line 213 decreases. When the amplitude becomes smaller, the voltage difference of the ELVDD signal transmitted on each of the first power supply lines 213 in the first circuit board 21 is smaller, thereby further improving the brightness in the display area corresponding to the display panel 10 connected to the first circuit board 21 uniformity.
相应的，当第三电源连接线222的各个部位的横截面积相等，且各条第二电源供应线221的横截面积都相等时，由于第三电源连接线222和第二电源供应线221的走线电阻的存在，电源模块211提供的ELVDD信号经过第一连接器24、第一电源连接线231和第二连接器25降压后，ELVDD信号在第三电源连接线222和第二电源供应线221上传输时的电压值也逐渐减小。因此，本申请实施例将第二电路板22中，从靠近电源模块211到远离电源模块211的方向上，第三电源连接线222的横截面积逐渐增大，和/或各条第二电源供应线221的横截面积依次递增，使得ELVDD信号在第三电源连接线222和第二电源供应线221上传输时的电压值的减小幅度变小，则第二电路板22上的 各个第二电源供应线221上传输的ELVDD信号的压差更小，从而进一步提高第二电路板22连接的显示面板10对应的显示区域内的亮度均匀性。Correspondingly, when the cross-sectional area of each part of the third power connection line 222 is equal, and the cross-sectional area of each second power supply line 221 is the same, because the third power connection line 222 and the second power supply line 221 In the presence of the trace resistance, after the ELVDD signal provided by the power module 211 is stepped down through the first connector 24, the first power connection line 231 and the second connector 25, the ELVDD signal is connected to the third power connection line 222 and the second power supply after the voltage is reduced. The voltage value during transmission on the supply line 221 also gradually decreases. Therefore, in the embodiment of the present application, in the second circuit board 22, from the direction close to the power supply module 211 to the direction away from the power supply module 211, the cross-sectional area of the third power supply connection line 222 gradually increases, and/or each second power supply The cross-sectional area of the supply line 221 increases sequentially, so that the reduction in the voltage value of the ELVDD signal when transmitted on the third power supply connection line 222 and the second power supply line 221 becomes smaller, then each of the first power supply lines on the second circuit board 22. The voltage difference between the ELVDD signals transmitted on the two power supply lines 221 is smaller, thereby further improving the luminance uniformity in the display area corresponding to the display panel 10 connected to the second circuit board 22 .
可选地，第一电源供应线213和第二电源连接线214同层设置，第二电源供应线221和第三电源连接线222同层设置。Optionally, the first power supply line 213 and the second power supply connection line 214 are provided on the same layer, and the second power supply line 221 and the third power supply connection line 222 are provided on the same layer.
当第一电路板21上的空间充足时，可将第一电源供应线213和第二电源连接线214同层设置，使得第一电源供应线213和第二电源连接线214的制作更为简单；当第二电路板22上的空间充足时，也可将第二电源供应线221和第三电源连接线222同层设置，使得第二电源供应线221和第三电源连接线222的制作更为简单。When the space on the first circuit board 21 is sufficient, the first power supply line 213 and the second power connection line 214 can be arranged on the same layer, so that the fabrication of the first power supply line 213 and the second power connection line 214 is simpler When the space on the second circuit board 22 is sufficient, the second power supply line 221 and the third power supply connection line 222 can also be arranged on the same layer, so that the production of the second power supply line 221 and the third power supply connection line 222 is easier. for simplicity.
当然，第一电源供应线213和第二电源连接线214也可以异层设置，例如，第一电源供应线213位于第一走线层，第二电源连接线214位于第二走线层，在第一走线层与第二走线层之间设置有第一绝缘层，第一电源供应线213通过贯穿第一绝缘层的第一过孔与第二电源连接线214连接；相应的，第二电源供应线221和第三电源连接线222也可以异层设置，例如，第二电源供应线221位于第三走线层，第三电源连接线222位于第四走线层，在第三走线层与第四走线层之间设置有第二绝缘层，第二电源供应线221通过贯穿第二绝缘层的第二过孔与第三电源连接线222连接。Of course, the first power supply line 213 and the second power connection line 214 may also be disposed in different layers. For example, the first power supply line 213 is located on the first wiring layer, and the second power supply line 214 is located on the second wiring layer. A first insulating layer is disposed between the first wiring layer and the second wiring layer, and the first power supply line 213 is connected to the second power supply connection line 214 through a first via hole passing through the first insulating layer; The two power supply lines 221 and the third power connection line 222 can also be disposed in different layers. For example, the second power supply line 221 is located on the third wiring layer, and the third power supply line 222 is located on the fourth wiring layer. A second insulating layer is disposed between the wiring layer and the fourth wiring layer, and the second power supply line 221 is connected to the third power supply connection line 222 through a second via hole penetrating the second insulating layer.
其中，第一电源供应线213和第二电源连接线214的材料相同，第二电源供应线221和第三电源连接线222的材料也相同。例如，第一电源供应线213、第二电源连接线214、第二电源供应线221和第三电源连接线222的材料均为铜。The materials of the first power supply wire 213 and the second power connection wire 214 are the same, and the materials of the second power supply wire 221 and the third power connection wire 222 are also the same. For example, the materials of the first power supply line 213 , the second power supply line 214 , the second power supply line 221 and the third power supply line 222 are all copper.
此外，第四电源连接线215可以与第一电源供应线213和第二电源连接线214同层设置，也可以与第一电源供应线213和第二电源连接线214异层设置，本申请实施例对此不作限制。In addition, the fourth power supply connection line 215 may be provided in the same layer as the first power supply connection line 213 and the second power supply connection line 214, or may be provided in a different layer with the first power supply connection line 213 and the second power supply connection line 214, which is implemented in this application. The example does not limit this.
如图1所示，电源模块211位于第一电路板21靠近第二电路板22的区域处。As shown in FIG. 1 , the power module 211 is located at a region of the first circuit board 21 close to the second circuit board 22 .
通过在第一电路板21靠近第二电路板22侧的边缘区域处设置电源模块211，使得电源模块211提供的ELVDD信号传输至第二电源供应线221时，其压降主要由第一连接器24、第一电源连接线231和第二连接器25影响，使得电源模块211经平衡电阻212提供给第一电源 供应线213的ELVDD信号的电压，与经第一连接器24、第一电源连接线231和第二连接器25提供给第二电源供应线221的ELVDD信号的电压的差值很小。By arranging the power module 211 at the edge area of the first circuit board 21 close to the second circuit board 22, when the ELVDD signal provided by the power module 211 is transmitted to the second power supply line 221, the voltage drop is mainly caused by the first connector 24. The first power supply connection line 231 and the second connector 25 influence the voltage of the ELVDD signal provided by the power supply module 211 to the first power supply line 213 via the balancing resistor 212, and the first power supply is connected to the first power supply via the first connector 24. The difference in voltage between the line 231 and the voltage of the ELVDD signal supplied to the second power supply line 221 by the second connector 25 is small.
如图1所示，显示模组还包括第一覆晶薄膜31和第二覆晶薄膜32，第一电路板21通过第一覆晶薄膜31与显示面板10绑定，第二电路板22通过第二覆晶薄膜32与显示面板10绑定。As shown in FIG. 1 , the display module further includes a first chip-on film 31 and a second chip-on film 32 , the first circuit board 21 is bound to the display panel 10 through the first chip-on film 31 , and the second circuit board 22 passes through The second chip on film 32 is bound to the display panel 10 .
第一覆晶薄膜31和第二覆晶薄膜32指的是COF(Chip On Film)，其上设置有走线，第一覆晶薄膜31上的走线将第一电路板21上的第一电源供应线213与显示面板10内的走线连接在一起，第二覆晶薄膜32上的走线将第二电路板22上的第二电源供应线221与显示面板10内的走线连接在一起。The first chip-on-film 31 and the second chip-on-film 32 refer to COF (Chip On Film), which are provided with wirings, and the wirings on the first chip-on-film 31 connect the first chip on the first circuit board 21 . The power supply line 213 is connected with the wiring in the display panel 10 , and the wiring on the second chip on film 32 connects the second power supply line 221 on the second circuit board 22 with the wiring in the display panel 10 . Together.
需要说明的是，第一电路板21与显示面板10通过两个第一覆晶薄膜31绑定，且每个第一覆晶薄膜31用于将两条第一电源供应线213与显示面板10内的走线连接；第二电路板22与显示面板10也通过两个第二覆晶薄膜32绑定，且每个第二覆晶薄膜32用于将两条第二电源供应线221与显示面板10内的走线连接。It should be noted that the first circuit board 21 and the display panel 10 are bound by two first chip on film 31 , and each first chip on film 31 is used to connect the two first power supply lines 213 to the display panel 10 The second circuit board 22 and the display panel 10 are also bound by two second chip on film 32, and each second chip on film 32 is used to connect the two second power supply lines 221 with the display Trace connections within panel 10 .
在实际产品中，第一电路板21为刚性印刷电路板或柔性印刷电路板，第二电路板22为刚性印刷电路板或柔性印刷电路板，第三电路板23为柔性电路板。In an actual product, the first circuit board 21 is a rigid printed circuit board or a flexible printed circuit board, the second circuit board 22 is a rigid printed circuit board or a flexible printed circuit board, and the third circuit board 23 is a flexible printed circuit board.
刚性印刷电路板指的是PCBA(Printed Circuit Board Assembly)，柔性印刷电路板指的是FPCA(Flexible Printed Circuit Assembly)，柔性电路板指的是FPC(Flexible Printed Circuit)。Rigid printed circuit board refers to PCBA (Printed Circuit Board Assembly), flexible printed circuit board refers to FPCA (Flexible Printed Circuit Assembly), and flexible printed circuit board refers to FPC (Flexible Printed Circuit).
其中，显示面板10为可折叠显示面板，可折叠显示面板的折叠轴11的延伸方向与第一电路板21指向第二电路板22的方向垂直，且折叠轴11沿延伸方向延伸后的延长线位于第三电路板23所在的区域内。The display panel 10 is a foldable display panel, the extension direction of the folding axis 11 of the foldable display panel is perpendicular to the direction in which the first circuit board 21 points to the second circuit board 22 , and the extension line after the folding axis 11 extends along the extension direction is located in the area where the third circuit board 23 is located.
在本申请实施例中，显示面板10可以是可折叠显示面板，其具有折叠轴11，位于折叠轴11两侧的显示面板10可以沿折叠轴11折叠或展开，此时，需要保证第三电路板23为柔性电路板，且折叠轴11沿延伸方向延伸后的延长线位于第三电路板23所在的区域内。In the embodiment of the present application, the display panel 10 may be a foldable display panel, which has a folding axis 11, and the display panels 10 located on both sides of the folding axis 11 can be folded or unfolded along the folding axis 11. At this time, it is necessary to ensure the third circuit The board 23 is a flexible circuit board, and the extension line of the folding shaft 11 extending along the extending direction is located in the area where the third circuit board 23 is located.
当然，显示面板10还可以为非折叠显示面板，其也可以分别与第一电路板11和第二电路板12连接，且第一电路板11和第二电路板12通过第三电路板13连接。Of course, the display panel 10 may also be a non-folding display panel, which may also be connected to the first circuit board 11 and the second circuit board 12 respectively, and the first circuit board 11 and the second circuit board 12 are connected through the third circuit board 13 . .
此外，显示面板10实际上为OLED(Organic Light Emitting Diode，有机发光二极管)面板。In addition, the display panel 10 is actually an OLED (Organic Light Emitting Diode, organic light emitting diode) panel.
在本申请实施例中，由于第一连接器和第二连接器的接触电阻以及第一电源连接线的走线电阻的存在，电源模块提供给第二电源供应线的ELVDD信号的电压值会降低，因此，通过在第一电路板上设置平衡电阻，使得电源模块提供给第一电源供应线的ELVDD信号的电压值也降低，从而减小第一电源供应线和第二电源供应线输入至显示面板的ELVDD信号的压差，提高了显示面板的显示亮度的均匀性。In the embodiment of the present application, due to the existence of the contact resistance of the first connector and the second connector and the wiring resistance of the first power supply line, the voltage value of the ELVDD signal provided by the power module to the second power supply line will decrease , therefore, by arranging a balance resistor on the first circuit board, the voltage value of the ELVDD signal provided by the power module to the first power supply line is also reduced, thereby reducing the input of the first power supply line and the second power supply line to the display The voltage difference of the ELVDD signal of the panel improves the uniformity of the display brightness of the display panel.
本申请实施例还公开了一种显示装置，包括上述的显示模组。The embodiment of the present application further discloses a display device including the above-mentioned display module.
在实际应用中，显示装置可以为：电子纸、手机、平板电脑、显示器、笔记本电脑、导航仪等任何具有显示功能的产品或部件。In practical applications, the display device may be any product or component with display function, such as electronic paper, mobile phone, tablet computer, display, notebook computer, and navigator.
当然，当显示模组中的显示面板10为可折叠显示面板时，显示装置还具有折叠功能。Of course, when the display panel 10 in the display module is a foldable display panel, the display device also has a folding function.
本文中所称的“一个实施例”、“实施例”或者“一个或者多个实施例”意味着，结合实施例描述的特定特征、结构或者特性包括在本公开的至少一个实施例中。此外，请注意，这里“在一个实施例中”的词语例子不一定全指同一个实施例。Reference herein to "one embodiment," "an embodiment," or "one or more embodiments" means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present disclosure. Also, please note that instances of the phrase "in one embodiment" herein are not necessarily all referring to the same embodiment.
在此处所提供的说明书中，说明了大量具体细节。然而，能够理解，本公开的实施例可以在没有这些具体细节的情况下被实践。在一些实例中，并未详细示出公知的方法、结构和技术，以便不模糊对本说明书的理解。In the description provided herein, numerous specific details are set forth. It is to be understood, however, that embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
在权利要求中，不应将位于括号之间的任何参考符号构造成对权利要求的限制。单词“包含”不排除存在未列在权利要求中的元件或步骤。位于元件之前的单词“一”或“一个”不排除存在多个这样的元件。本公开可以借助于包括有若干不同元件的硬件以及借助于适当编程的计算机来实现。在列举了若干装置的单元权利要求中，这些装置中的若干个可以是通过同一个硬件项来具体体现。单词第一、第二、以及第三等的使用不表示任何顺序。可将这些单词解释为名称。In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, and third, etc. do not denote any order. These words can be interpreted as names.
最后应说明的是：以上实施例仅用以说明本公开的技术方案，而非对其限制；尽管参照前述实施例对本公开进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者 替换，并不使相应技术方案的本质脱离本公开各实施例技术方案的精神和范围。Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, but not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims (12)

  1. 一种显示模组，其中，包括：A display module, comprising:
    显示面板；display panel;
    电路板组件，所述电路板组件包括第一电路板、第二电路板、第三电路板、第一连接器和第二连接器；a circuit board assembly comprising a first circuit board, a second circuit board, a third circuit board, a first connector, and a second connector;
    其中，所述第一电路板上设置有电源模块、平衡电阻和多条第一电源供应线，所述平衡电阻的第一端与所述电源模块连接，所述平衡电阻的第二端与每条所述第一电源供应线的第一端均连接，每条所述第一电源供应线的第二端与所述显示面板连接；Wherein, a power module, a balance resistor and a plurality of first power supply lines are arranged on the first circuit board, the first end of the balance resistor is connected to the power module, and the second end of the balance resistor is connected to each The first ends of the first power supply lines are all connected, and the second ends of each of the first power supply lines are connected to the display panel;
    所述第二电路板上设置有多条第二电源供应线，所述第三电路板上设置有第一电源连接线，所述第一电源连接线的第一端通过所述第一连接器与所述电源模块连接，所述第一电源连接线的第二端通过所述第二连接器与每条所述第二电源供应线的第一端均连接，每条所述第二电源供应线的第二端与所述显示面板连接；The second circuit board is provided with a plurality of second power supply lines, the third circuit board is provided with a first power supply connection line, and the first end of the first power supply connection line passes through the first connector connected to the power module, the second end of the first power connection line is connected to the first end of each of the second power supply lines through the second connector, and each of the second power supply lines the second end of the line is connected to the display panel;
    所述第一电源供应线和所述第二电源供应线，被配置为向所述显示面板输入电源电压信号。The first power supply line and the second power supply line are configured to input power supply voltage signals to the display panel.
  2. 根据权利要求1所述的显示模组，其中，所述平衡电阻的第一阻值与第二阻值的比值为0.9至1.1，所述第二阻值为所述第一连接器的接触电阻、所述第二连接器的接触电阻和所述第一电源连接线的走线电阻的阻值之和。The display module of claim 1, wherein a ratio of a first resistance value to a second resistance value of the balance resistor is 0.9 to 1.1, and the second resistance value is a contact resistance of the first connector , the sum of the resistance value of the contact resistance of the second connector and the wiring resistance of the first power supply connection line.
  3. 根据权利要求1所述的显示模组，其中，所述第一电路板上还设置有第二电源连接线，每条所述第一电源供应线均通过所述第二电源连接线与所述平衡电阻连接；The display module according to claim 1, wherein a second power supply line is further provided on the first circuit board, and each of the first power supply lines is connected to the second power supply line through the second power supply line. Balance resistance connection;
    所述第二电路板上还设置有第三电源连接线，每条所述第二电源供应线均通过所述第三电源连接线与所述第二连接器连接。The second circuit board is further provided with a third power supply connection line, and each of the second power supply supply lines is connected to the second connector through the third power supply connection line.
  4. 根据权利要求3所述的显示模组，其中，在所述第一电路板中，从靠近所述电源模块到远离所述电源模块的方向上，所述第二电源连接线的横截面积逐渐增大，和/或，各条所述第一电源供应线的横截面积依次递增；The display module according to claim 3, wherein, in the first circuit board, a cross-sectional area of the second power supply connection line gradually increases from a direction close to the power supply module to a direction away from the power supply module increase, and/or, the cross-sectional area of each of the first power supply lines is sequentially increased;
    在所述第二电路板中，从靠近所述电源模块到远离所述电源模块的方向上，所述第三电源连接线的横截面积逐渐增大，和/或，各条所述第二电源供应线的横截面积依次递增。In the second circuit board, the cross-sectional area of the third power supply connection line gradually increases from the direction close to the power supply module to the direction away from the power supply module, and/or, each of the second power supply connection lines increases gradually. The cross-sectional area of the power supply lines increases sequentially.
  5. 根据权利要求3所述的显示模组，其中，所述第一电源供应线和所 述第二电源连接线同层设置，所述第二电源供应线和所述第三电源连接线同层设置。The display module according to claim 3, wherein the first power supply line and the second power connection line are arranged in the same layer, and the second power supply line and the third power supply connection line are arranged in the same layer .
  6. 根据权利要求1所述的显示模组，其中，所述第一电路板上还设置有第四电源连接线，所述平衡电阻通过所述第四电源连接线与所述电源模块连接，所述第一连接器通过所述第四电源连接线与所述电源模块连接。The display module according to claim 1, wherein a fourth power supply connection line is further provided on the first circuit board, and the balancing resistor is connected to the power supply module through the fourth power supply connection line, and the The first connector is connected to the power module through the fourth power connection wire.
  7. 根据权利要求1所述的显示模组，其中，所述平衡电阻的精度小于或等于1％。The display module according to claim 1, wherein the precision of the balance resistance is less than or equal to 1%.
  8. 根据权利要求1所述的显示模组，其中，所述电源模块位于所述第一电路板靠近所述第二电路板的区域处。The display module of claim 1, wherein the power module is located at a region of the first circuit board close to the second circuit board.
  9. 根据权利要求1所述的显示模组，其中，所述显示模组还包括第一覆晶薄膜和第二覆晶薄膜，所述第一电路板通过所述第一覆晶薄膜与所述显示面板绑定，所述第二电路板通过所述第二覆晶薄膜与所述显示面板绑定。The display module according to claim 1, wherein the display module further comprises a first chip-on film and a second chip-on film, and the first circuit board is connected to the display through the first chip-on film. Panel binding, the second circuit board is bound to the display panel through the second chip on film.
  10. 根据权利要求1所述的显示模组，其中，所述第一电路板为刚性印刷电路板或柔性印刷电路板，所述第二电路板为刚性印刷电路板或柔性印刷电路板，所述第三电路板为柔性电路板。The display module according to claim 1, wherein the first circuit board is a rigid printed circuit board or a flexible printed circuit board, the second circuit board is a rigid printed circuit board or a flexible printed circuit board, and the first circuit board is a rigid printed circuit board or a flexible printed circuit board. The three circuit boards are flexible circuit boards.
  11. 根据权利要求1所述的显示模组，其中，所述显示面板为可折叠显示面板，所述可折叠显示面板的折叠轴的延伸方向与所述第一电路板指向所述第二电路板的方向垂直，且所述折叠轴沿所述延伸方向延伸后的延长线位于所述第三电路板所在的区域内。The display module according to claim 1, wherein the display panel is a foldable display panel, and the extension direction of the folding axis of the foldable display panel is the same as that of the first circuit board pointing to the second circuit board The direction is vertical, and the extension line after the folding axis extends along the extending direction is located in the area where the third circuit board is located.
  12. 一种显示装置，其中，包括如权利要求1至11中任一项所述的显示模组。A display device, comprising the display module according to any one of claims 1 to 11.
PCT/CN2021/126052 2021-04-29 2021-10-25 Display module and display device WO2022227443A1 (en)

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